GB876415A - Improvements in or relating to undervoltage sensing circuits - Google Patents

Improvements in or relating to undervoltage sensing circuits

Info

Publication number
GB876415A
GB876415A GB3545459A GB3545459A GB876415A GB 876415 A GB876415 A GB 876415A GB 3545459 A GB3545459 A GB 3545459A GB 3545459 A GB3545459 A GB 3545459A GB 876415 A GB876415 A GB 876415A
Authority
GB
United Kingdom
Prior art keywords
transistor
voltage
phase
rectifier
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3545459A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB876415A publication Critical patent/GB876415A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
    • G05B1/01—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric
    • G05B1/02—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0038—Details of emergency protective circuit arrangements concerning the connection of the detecting means, e.g. for reducing their number
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H02H3/247—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage having timing means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/08—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices
    • H03K19/082—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices using bipolar transistors
    • H03K19/084—Diode-transistor logic

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Automation & Control Theory (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

876,415. Protective arrangements. WESTINGHOUSE ELECTRIC CORPORATION. Oct. 20, 1959 [Oct. 27, 1958], No. 35454/59. Class 38 (5). [Also in Group XL (c)] An undervoltage protective arrangement comprises means connected to each phase of a polyphase system for providing a signal voltage when the corresponding phase voltage is above a predetermined value, and transistor means controlled by the signal voltages for providing an output signal in the absence of any one of the signal voltages. In Fig. 1 there is connected to each phase voltage-dividing resistors 2, 3, a rectifier 4 and a potentiometer 5, and the resulting unidirectional voltage signals normally bias rectifiers 7 to their non-conducting condition so that the bias applied to the base of a transistor 11 from a source 8 causes the transistor to conduct. Under these conditions no voltage is applied across a capacitor 13. If the voltage of any phase falls below the predetermined value, the corresponding rectifier 7 is " unblocked " so that current can flow from the source 8 through the rectifier to earth causing the transistor to become non-conductive. The resulting output signal appearing at the collector of the transistor charges the capacitor 13 until the breakdown voltage of a Zener diode 14 is reached and a control device 15 is then operated. The device 15 may be a relay, a flip-flop circuit or an amplifier. Fig. 2 (not shown) illustrates a modified circuit in which a transistor is associated with each phase.
GB3545459A 1958-10-27 1959-10-20 Improvements in or relating to undervoltage sensing circuits Expired GB876415A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76964958 US3001100A (en) 1958-10-27 1958-10-27 Undervoltage sensing circuit

Publications (1)

Publication Number Publication Date
GB876415A true GB876415A (en) 1961-08-30

Family

ID=72645559

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3545459A Expired GB876415A (en) 1958-10-27 1959-10-20 Improvements in or relating to undervoltage sensing circuits

Country Status (5)

Country Link
US (1) US3001100A (en)
JP (1) JPS3515321B1 (en)
CA (1) CA644642A (en)
FR (1) FR1239119A (en)
GB (1) GB876415A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833460A (en) * 1987-02-02 1989-05-23 Sabo Thomas E Phasing indicator

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184644A (en) * 1959-04-20 1965-05-18 Electric Products Engineering Polyphase electroresponsive apparatus
US3421028A (en) * 1959-11-24 1969-01-07 Allis Chalmers Mfg Co Static protective relay system
US3201649A (en) * 1960-04-20 1965-08-17 Alpha Instr Inc Transistor protection circuit
FR1267270A (en) * 1960-06-09 1961-07-21 Electronique Et D Automatique Control device for a protection relay for an electrical power supply circuit
US3147400A (en) * 1960-11-01 1964-09-01 Mallory & Co Inc P R Transistor circuit interrupting device
US3155959A (en) * 1960-11-04 1964-11-03 Westinghouse Electric Corp Timed output pulse providing device responsive to digital input signals
US3193807A (en) * 1960-12-30 1965-07-06 Ibm Electrical sampling switch
US3313984A (en) * 1963-10-11 1967-04-11 Gen Electric Instantaneous multiphase undervoltage sensing circuit
US3332004A (en) * 1963-10-31 1967-07-18 Motorola Inc Electrical generator system
GB1090901A (en) * 1964-02-13 1967-11-15 English Electric Co Ltd Protective relay apparatus
US3335325A (en) * 1964-09-28 1967-08-08 American Mach & Foundry Voltage sensitive control device
US3343036A (en) * 1964-12-17 1967-09-19 Gen Electric Static undervoltage circuit
US3484702A (en) * 1965-06-09 1969-12-16 American Mach & Foundry Voltage sensitive and harmonic control circuit
US3513372A (en) * 1966-03-23 1970-05-19 Cadillac Gage Co System and method for detecting when the damped oscillatory error signal of a servomechanism is nulled
US3480834A (en) * 1966-09-19 1969-11-25 Westinghouse Electric Corp Miniature overvoltage protection circuit having separate voltage sensing and time delay circuits
US3489920A (en) * 1966-11-15 1970-01-13 American Mach & Foundry Overvoltage and undervoltage detection circuit means
US3536957A (en) * 1968-10-10 1970-10-27 Smith Corp A O Polyphase circuit input fault detection system
US3641548A (en) * 1969-02-17 1972-02-08 Larry A Groce Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system
US3643247A (en) * 1969-12-22 1972-02-15 Lockheed Aircraft Corp Apparatus for detecting open-circuit condition
US3584259A (en) * 1970-03-02 1971-06-08 Gen Motors Corp Phase failure detection system
US3629713A (en) * 1970-06-01 1971-12-21 Stanislaw Szpilka Method of obtaining the signal dependent upon the percentage asymmetry of a 3-phase system
US3749944A (en) * 1971-08-19 1973-07-31 Westinghouse Electric Corp Undervoltage sensing circuit
US3654539A (en) * 1972-02-11 1972-04-04 Westinghouse Electric Corp Ac-dc converter
US3836790A (en) * 1973-08-22 1974-09-17 Lorain Prod Corp A-c voltage detector
US3843908A (en) * 1973-12-03 1974-10-22 Coilcraft Inc Voltage failure sensing circuit
JPS5417047Y2 (en) * 1974-06-24 1979-07-03
US4255774A (en) * 1979-03-16 1981-03-10 General Electric Company Static instantaneous overcurrent relay with low transient overreach
US4241373A (en) * 1979-03-30 1980-12-23 Mcgraw-Edison Company Switchgear voltage sensor
FR2553943B1 (en) * 1983-10-24 1986-04-11 Merlin Gerin RESIDUAL DIFFERENTIAL DEVICE PROVIDED WITH A DEVICE FOR MONITORING THE ELECTRONIC POWER SOURCE
FR2630583B1 (en) * 1988-04-18 1994-05-27 Bassani Spa MINIMUM VOLTAGE HANGING DEVICE
FI115092B (en) * 2003-05-15 2005-02-28 Abb Oy Phase monitor and device comprising phase monitor
ITMI20090310A1 (en) * 2009-03-03 2010-09-04 Dino Ghilardi APPARATUS AND METHOD OF DETECTION OF FAILURE IN A POLYPHASE DISTRIBUTION LINE
US10790403B1 (en) 2013-03-14 2020-09-29 nVizix LLC Microfabricated vacuum photodiode arrays for solar power

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979054A (en) * 1933-12-01 1934-10-30 Bell Telephone Labor Inc Signaling system
US2393043A (en) * 1942-10-30 1946-01-15 Westinghouse Electric Corp Minimum-voltage network and system
US2594449A (en) * 1950-12-30 1952-04-29 Bell Telephone Labor Inc Transistor switching device
US2769131A (en) * 1953-10-30 1956-10-30 Westinghouse Electric Corp Motor acceleration system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833460A (en) * 1987-02-02 1989-05-23 Sabo Thomas E Phasing indicator

Also Published As

Publication number Publication date
JPS3515321B1 (en) 1960-10-14
CA644642A (en) 1962-07-10
FR1239119A (en) 1960-08-19
US3001100A (en) 1961-09-19

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